From Longman Dictionary of Contemporary Englishgrit your teethgrit your teethDETERMINED a) to use all your determination to continue in spite of difficulties Just grit your teeth and hang on – it’ll be over soon. b) to bite your teeth together, especially when you are in pain, angry, or under pressure Ben gritted his teeth, hoping Sasha wouldn’t notice his fear. ‘No, that’s alright, ’ she said through gritted teeth. → grit
Examples from the Corpusgrit your teeth• And a seizure makes you grit your teeth.• He gritted his teeth against the demand of his lungs to burst.• Rescue workers here have little choice but to grit their teeth and get on with the grim task of recovering the bodies.• I was desperately unhappy in that job, but had to grit my teeth and stay smiling for the sake of my children.• She would grit her teeth and take everything he threw at her - for the time being.• I guess I'll have to just grit my teeth and wait for things to get better.• I gritted my teeth and went to work.• She continued to grit her teeth in silence.• He gritted his teeth like a cliff.• Rory gritted his teeth, pulled.